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Uromodulin: from monogenic to multifactorial diseases.

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Area of Science:

  • Nephrology
  • Molecular Biology
  • Genetics

Background:

  • Uromodulin (UMOD) is the primary protein in urine, produced in kidney thick ascending limb (TAL) cells.
  • UMOD's physiological roles in water/electrolyte balance, innate immunity, and protection against urinary tract infections and kidney stones are under investigation.
  • Mutations in UMOD cause uromodulin-associated kidney diseases (UAKDs), characterized by tubulointerstitial fibrosis, impaired urinary concentration, hyperuricemia, and kidney failure due to impaired intracellular trafficking.

Purpose of the Study:

  • To elucidate the enigmatic role of uromodulin (UMOD) in renal physiology.
  • To understand the pathogenic mechanisms of uromodulin-associated kidney diseases (UAKDs).
  • To clarify the link between UMOD gene variants and susceptibility to chronic kidney disease (CKD) and hypertension.

Main Methods:

  • Review of existing literature on UMOD function, mutations, and genetic associations.
  • Analysis of studies linking UMOD variants to CKD and hypertension.
  • Investigation of the molecular mechanisms connecting UMOD to renal pathophysiology.

Main Results:

  • UMOD mutations lead to delayed intracellular trafficking and accumulation, causing UAKDs.
  • Genome-wide association studies identified UMOD variants associated with CKD and hypertension.
  • A recent study linked UMOD to hypertension via overactivation of the TAL sodium-potassium-chloride co-transporter NKCC2.

Conclusions:

  • UMOD plays a critical role in kidney function and disease pathogenesis.
  • UMOD is implicated in both rare hereditary kidney diseases and common complex traits like CKD and hypertension.
  • Targeting UMOD presents a potential therapeutic strategy for managing hypertension and preserving renal function.